While SIG no longer sells the limited semi-auto SG552 SBR models, they now sell a SG553 look-a-like, the SIG Sauer SIG551-A1 5.56x45mm SBR with 10 inch barrel.
In the US SIG has added several short barreled rifles to their lineup. Here is a photo rundown of currently available models.
SIG Sauer SIG516 10″ 5.56x45mm
SIG Sauer SIG516 PDW 7.5″ 5.56x45mm
SIG Sauer SIG716 12in .308/7.62x51mm
SIG Sauer SIG522 SWAT 10in .22LR
While the ACP is just a conversion kit, and not a firearm, it can make your pistol into an SBR. Th SIG Sauer ACP LE